Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones descargar pdf (Pagina 7)

EZH and EZHSO Series

of the two regulators. The decision to use either an

upstream or downstream monitoring system is largely

a matter of personal preference or company policy.

In normal operation of a wide open conguration,

the working regulator controls the system’s outlet

pressure. With a higher outlet pressure setting, the

monitor regulator senses a pressure lower than its

setpoint and tries to increase outlet pressure by going

wide open. If the working regulator fails, the monitoring

regulator assumes control and holds the outlet

pressure at its outlet pressure setting.

Figure 5 shows an upstream wide-open monitor

EZH Series (failed-close) and a downstream active

regulator EZHSO Series (failed-open). In this

installation, if the EZHSO Series regulator no longer

controls downstream pressure, it will remain open,

letting the EZH Series monitor regulator take control

of the downstream pressure. If the EZH Series should

fail, the monitor regulator will go closed and protect

against overpressure to the downstream system.

Figure 5. Wide-Open Monitoring System Operational Schematics

M1164

EZH SERIES

EZHSO SERIES

TYPE

SA/2

CHECK VALVE

TYPE

SA/2

TYPE

PRX

TYPE

PRX

L A

Working Monitoring System (Figure 6)

In a working monitoring system, the upstream

regulator requires two pilots and it is always the

monitoring regulator. The additional pilot permits

the monitoring regulator to act as a series regulator

to control an intermediate pressure during normal

operation. In this way, both units are always operating

and can be easily checked for proper operation. See

Installation section.

In normal operation, the working regulator controls

the outlet pressure of the system. The monitoring

regulator’s working pilot controls the intermediate

pressure and the monitoring pilot senses the system’s

outlet pressure. If the working regulator fails, the

monitoring pilot will sense the increase in outlet

pressure and take control.

TYPE PRX

S - BLEED PORT

B - SUPPLY PORT

L - LOADING PORT

A - SENSING PORT

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

INTERMEDIATE PRESSURE

PILOT SUPPLY PRESSURE

LOADING PRESSURE

TYPE SA/2:

V - SENSING PORT

R - PILOT SUPPLY PORT

M - INLET PORT

1 2 3 4 5 6 7 8 9 10 11 12 ... 39 40

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones Pagina 7

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